| 摘要 |
PROBLEM TO BE SOLVED: To reduce sound of exhaust air and to perform efficient cooling. SOLUTION: A plurality of partitions and/or space parts are provided between an optical engine part and other heat generation parts in a casing, a suction port and an exhaust port are formed on each casing part partitioned by the space part and/or the partition, and an exhaust duct formed between the suction port and the exhaust port and/or an exhaust duct formed by a plurality of partitions is arranged. Thus, discharged heat generated in the optical engine part and other heat generation parts is discharged through each exhaust duct, so that the efficient exhaust of air is performed. COPYRIGHT: (C)2004,JPO
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